in October and give a clear gauge on the likely final result as the country battles against a swirling economic crisis.
Polls opened at 8am (11:00 GMT) on Sunday, with results expected to start coming in from 9pm (00:00 GMT).
The two main political blocs face internal leadership battles and the vote will determine who will be the presidential candidate in the main center-right opposition coalition in which Buenos Aires Mayor Horacio Rodriguez Larreta is facing off against former Security Minister Patricia Bullrich.
Whoever comes out on top will run against a candidate from the ruling coalition, where Economy Minister Sergio Massa faces a leftist challenger.
The primary will also reveal how much traction right-wing populist candidate Javier Milei has gained with voters. An admirer of former US President Donald Trump, Milei has attracted voters with an anti-establishment message that has particularly resonated with the young.

Al Jazeera’s Teresa Bo reports from Buenos Aires, Argentina.

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